15 Common Sendgrid API Errors and How to Fix Them

When it comes to email delivery, SendGrid is a popular choice for developers and marketers alike. However, even the most reliable platforms can encounter errors. In this article, we'll explore 15 common SendGrid API errors and provide practical solutions to fix them.

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1. Error: "Unauthorized" (401)

This error occurs when your API request is not authenticated. Ensure you're using the correct API key and that it has the necessary permissions. If you're using Basic Authentication, double-check your username and password.

Fix:

• Verify your API credentials.
• Ensure your API key has the correct permissions.

2. Error: "The provided authorization grant is invalid, expired, or revoked"

This error suggests an issue with your OAuth token. It might have expired or been revoked.

Fix:

• Refresh or regenerate your OAuth token.
• Ensure your application has the correct OAuth scopes.

3. Error: "The email address is not valid" (400)

SendGrid validates email addresses before sending. An invalid email format will trigger this error.

Fix:

• Double-check the email address format.
• Use a valid email validation library or regular expression to verify addresses.

4. Error: "Request body is too large" (413)

If your API request exceeds SendGrid's size limits, you'll encounter this error.

Fix:

• Reduce the size of your request body.
• Split large requests into smaller ones.

5. Error: "The from address does not match a verified Sender Identity"

SendGrid requires you to verify sender identities to prevent email spoofing.

Fix:

• Verify the sender email address in your SendGrid account.
• Use a verified domain or email address as the sender.

6. Error: "Unable to process JSON"

Malformed or invalid JSON in your API request can cause this error.

Fix:

• Validate your JSON using a JSON validator.
• Ensure all strings are properly quoted, and objects/arrays are structured correctly.

7. Error: "The subscription is inactive, unreachable, or expired"

This error indicates an issue with your SendGrid account status.

Fix:

• Check your SendGrid account status and subscription details.
• Contact SendGrid support if needed.

8. Error: "The resource you are attempting to access does not exist" (404)

You might be trying to access a resource that doesn't exist or has been deleted.

Fix:

• Verify the resource ID or endpoint you're trying to access.
• Check if the resource has been recently deleted or modified.

9. Error: "Too Many Requests" (429)

Exceeding SendGrid's rate limits can lead to this error.

Fix:

• Reduce the frequency of your API requests.
• Implement rate limiting and backoff strategies in your code.

10. Error: "Internal Server Error" (500)

This is a generic server-side error, typically indicating an issue with SendGrid's servers.

Fix:

• Wait and retry your request later.
• Contact SendGrid support for assistance.

11. Error: "Service not available" (503)

SendGrid's services might be temporarily unavailable.

Fix:

• Wait for SendGrid to restore its services.
• Monitor SendGrid's status page for updates.

12. Error: "Timeout"

Your API request might have timed out due to various reasons.

Fix:

• Increase the timeout duration in your code.
• Check your network connection and latency.

13. Error: "Bad Request" (400)

This generic error can have multiple causes, such as missing or invalid parameters.

Fix:

• Review your API request for any missing or incorrect parameters.
• Refer to SendGrid's API documentation for required fields.

14. Error: "Forbidden" (403)

You might be trying to access a resource you're not authorized to use.

Fix:

• Check your API key permissions.
• Ensure your account has access to the requested resource.

15. Error: "Not Found" (404)

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